The Aftermath covers events taking place after the end of the Human-Covenant War between 2553 CE - 2556 CE. This includes the reconstruction of UEG colonies, the continuation of the Great Schism and the early post-Covenant War conflicts.

The Return of the Prometheans includes events from 2557 CE and 2558 CE, such as the engagements on Requiem and the re-awakening of the Ur-Didact, leading to a resurgence of Forerunner activity in the galaxy.

↑Curator's timeline serves as the in-universe framing device of the reference book Halo Mythos. Mythos is written with concern to the inclusion of events from most Halo media, which are largely concentrated in select points of the timeline, as well as real-world presentation reasons; this results in a somewhat lopsided distribution of its discrete "eras". In-universe, as Curator is a UNSC AI, the timeline displays a notable human bias. Therefore, a true "historical" timeline from a neutral standpoint would likely be segmented more evenly. However, the timeline is nonetheless used by Halopedia as it is the only definitive canon timeline available.

↑Halo Mythos places the beginning of the "Rise of Humanity" era to 2080 CE. However, as Halopedia covers a number of in-universe events between 852 CE and 2080 CE, the several-hundred-year gap since the end of "The Forerunner Legacy" is appended to the "Rise of Humanity" for the sake of convenience.